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ObjectAnalyzerTest.java
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57 lines (41 loc) · 1.2 KB
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package Chapter5;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Date;
import javax.swing.JComponent;
public class ObjectAnalyzerTest {
public static void main(String[] args) {
JComponent jc=new JComponent() {
};
Class cs=jc.getClass();
/*Field[] fs=cs.getFields();
for(Field ff:fs){
System.out.println("fields::"+ff.getName());
}*/
try {
//"WHEN_FOCUSED"是JComponent的一个域
Field f=cs.getField("WHEN_FOCUSED");
//强大的Field f.get(Object obj)方法，可以取得当前对象中的值，如果是基本数据类型，就getInt(),,,
//如果此Field为私有，方法setAccessible()覆盖访问权限
Object o= f.get(jc);
System.out.println("WHEN_FOCUSED中的值"+o);
} catch (NoSuchFieldException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*
*
* 应用：一个通用的toString（）方法
* */
}
}